JIS G3452
JIS G3452
JIS G3452, a Japanese Industrial Standard, describes the carbon steel pipes, referred to as “pipes” in this document, that are used in the piping for the conveyance of steam, water, oil, gas, air, and other fluids, among other things, in Japan. Working pressures are quite modest in this case.
PRODUCT FEATURES
Steel Grades of JIS G3452 Pipes
Classification and Symbol of JIS G3452 Pipe
JIS G3452 pipes should be categorized into one grade, with its letter symbol being as shown in the following table, and further separated into black pipes and galvanized pipes based on the presence or absence of zinc-coated coatings on the outside of the pipe.
Letter symbol of grade | Division | Remark |
SGP | Black pipe | Pipe without zinc coating |
Galvanized pipe | Pipe with zinc coating |
Note: The suffix “-ZN” should be added to the letter sign of the grade in cases when it is important to distinguish galvanized pipe from other types of pipes on drawings and other documents. This indication, on the other hand, should not be applied to the actual product.
Dimensions, Weight and Dimensional Tolerances of JIS G3452 Pipes
JIS G3452 Dimensions, Weights and Dimensional Tolerances | |||||||
Nominal Diameter | O.D. mm | O.D. Tolerances | W.T. mm | W.T. Tolerances | Unit Mass excluding Socket kg/m | ||
A | B | Pipes to be cut in taper thread | Other pipes | ||||
6 | 1/8 | 10.5 | ±0.5mm | ±0.5mm | 2.0 | +Not specified -12.5% | 0.419 |
8 | 1/4 | 13.8 | ±0.5mm | ±0.5mm | 2.3 | 0.652 | |
10 | 3/8 | 17.3 | ±0.5mm | ±0.5mm | 2.3 | 0.851 | |
15 | 1/2 | 21.7 | ±0.5mm | ±0.5mm | 2.8 | 1.31 | |
20 | 3/4 | 27.2 | ±0.5mm | ±0.5mm | 2.8 | 1.68 | |
25 | 1 | 34.0 | ±0.5mm | ±0.5mm | 3.2 | 2.43 | |
32 | 1 1/4 | 42.7 | ±0.5mm | ±0.5mm | 3.5 | 3.38 | |
40 | 1 1/2 | 48.6 | ±0.5mm | ±0.5mm | 3.5 | 3.89 | |
50 | 2 | 60.5 | ±0.5mm | ±1% | 3.8 | 5.31 | |
65 | 2 1/2 | 76.3 | ±0.7mm | ±1% | 4.2 | 7.47 | |
80 | 3 | 89.1 | ±0.8mm | ±1% | 4.2 | 8.79 | |
90 | 3 1/2 | 101.6 | ±0.8mm | ±1% | 4.2 | 10.1 | |
100 | 4 | 114.3 | ±0.8mm | ±1% | 4.5 | 12.2 | |
125 | 5 | 139.8 | ±0.8mm | ±1% | 4.5 | 15.0 | |
150 | 6 | 165.2 | ±0.8mm | ±1.6mm | 5.0 | 19.8 | |
175 | 7 | 190.7 | ±0.9mm | ±1.6mm | 5.3 | 24.2 | |
200 | 8 | 216.3 | ±1.0mm | ±0.8% | 5.8 | 30.1 | |
225 | 9 | 241.8 | ±1.2mm | ±0.8% | 6.2 | 36.0 | |
250 | 10 | 267.4 | ±1.3mm | ±0.8% | 6.6 | 42.4 | |
300 | 12 | 318.5 | ±1.5mm | ±0.8% | 6.9 | 53.0 | |
350 | 14 | 355.6 | – | ±0.8% | 7.9 | 67.7 | |
400 | 16 | 406.4 | – | ±0.8% | 7.9 | 77.6 | |
450 | 18 | 457.2 | – | ±0.8% | 7.9 | 87.5 | |
500 | 20 | 508.0 | – | ±0.8% | 7.9 | 97.4 | |
Chemical Composition of JIS G3452 Pipe
Steel Grade | P | S |
SGP | 0.040max. | 0.040max. |
Mechanical Properties of JIS G3452 Pipe
Letter Symbol of Grade | Tensile Test | ||
Tensile Strength | Elongation (%) | ||
No. 11 and No. 12 Test Pieces | No. 5 Test Piece | ||
Longitudinal | Transverse | ||
SGP | 30 {294} min. | 30 min. | 25 min. |
Note：
- When the Tensile test is performed on the No. 12 or No. 5 test piece for a pipe with a wall thickness of less than 8mm, the minimum value of elongation shall be obtained by subtracting 1.5 percent from the values of elongation given in Table 3-1 for each 1mm decrease in wall thickness and rounding off to an integer by JIS Z 8401, the minimum value of elongation shall be obtained by subtracting 1.5 percent from the values of elongation In the Reference Table, you can find examples of calculations.
- The elongation values shown in the table are not applicable to pipes with a nominal size of 32 A or less, as specified in the table. The value of elongation, on the other hand, must be documented.
If the tensile test pieces are being sampled, the No. 12 and No. 5 test pieces should be obtained from the area of the component that does not have any welded seams.
Reference Table of JIS G3452 Pipe
For the No. 12 Test Piece (Longitudinal) and No. 5 Test Piece (Transverse), obtained from pipes with wall thicknesses less than 8mm, examples of calculated elongation values are shown.
The shape of Test Piece | Elongation Values for Wall Thickness Divisions (%) | ||||
7mm-8mm | 6mm-7mm | 5mm-6mm | 5mm-4mm | 4mm-3mm | |
No. 12 test piece | 30 | 28 | 27 | 26 | 24 |
No. 5 test piece | 25 | 24 | 22 | 20 | 19 |
Test and Inspections of JIS G3452 pipe
- Chemical Analysis
Analytical Chemistry In line with JIS G 0303, general topics common to chemical analysis, as well as the process of sampling specimens for chemical analysis, should be followed.
A technique of analysis in compliance with one of the following Standards must be used: Analytical Method
The JIS G 1214, JIS G 1215, JIS G 1253, JIS G 1256, and JIS G 1257 standards are among the most widely used in the world.
- Tensile Test
A piece of testing unless otherwise indicated in JIS Z 2201, the test specimen shall be a test piece designated by the numbers 11, 12, A, 12, B, 12, C, or No. 5 as defined in JIS Z 2201 and shall be sampled from a pipe.
- Hydrostatic Test or Nondestructive Test
Tests on the black pipe must be carried out, and the hydrostatic characteristic or nondestructive characteristic obtained must meet either of the two requirements listed below. This decision will be left to the specification of the purchaser or the discretion of the manufacturer, depending on which one is preferred by the manufacturer.
- Flattening Test
Test piece a test piece 50 mm or over in length shall be cut off from the end of a pipe.
Marking of JIS G3452 pipe
A label containing the following information should be placed on each pipe that has passed inspection: smaller pipes and other pipes were chosen by the purchaser, on the other hand, maybe bundled together and tagged with a unique identification number for each bundle. The sequence in which the indicated items should be arranged is not stated in either situation.
Part of the products may be omitted if the purchaser gives his or her approval.
- The grade is represented by a letter sign.
- A letter sign that represents the manufacturing processes
- Dimensions
- Manufacturer’s name or its identifying brand
